Differences between Isblank and IsEmpty methods in the Org.apache.commons.lang3.StringUtils class

I believe many Java programmers when writing code when it is necessary to determine whether a string is empty when the StringUtils class will use the Isblank and IsEmpty methods, what is the difference between the two methods? Let's use a piece of code to illustrate the difference:

1     @Test 2      Public void Blankempty () {3         String str = ""; 4         System.out.println ("is empty" + Stringutils.isempty (str)); 5         System.out.println ("is blank?" + Stringutils.isblank (str)); 6     }

That is, the Isblank method will remove the space to determine whether STR length is 0, and the IsEmpty method will not ignore the space, directly calculate the length of STR, the length of more than 0 returns false.

Differences between Isblank and IsEmpty methods in the Org.apache.commons.lang3.StringUtils class